Download AC Induction Motor

Freescale Semiconductor, Inc.
Motorola DSP Advantages and Features
2.
Motorola DSP Advantages and Features
The Motorola DSP56F80x family is well-suited for digital motor control, combining the DSP’s
calculation capability with an MCU’s controller features on a single chip. These DSPs offer many
dedicated peripherals, including a Pulse Width Modulation (PWM) unit, an Analog-to-Digital
Converter (ADC), timers, communication peripherals (SCI, SPI, CAN), on-board Flash and RAM.
Generally, all the family members are well-suited for AC induction motor control.
Freescale Semiconductor, Inc...
A typical member of the family, the DSP56F805, provides the following peripheral blocks:
•
Two Pulse Width Modulator units (PWMA & PWMB), each with six PWM outputs, three
Current Sense inputs, and four Fault inputs, fault tolerant design with deadtime insertion;
supports both Center- and Edge-aligned modes
•
12-bit Analog-to-Digital Convertors (ADCs), supporting two simultaneous conversions with
dual 4-pin multiplexed inputs; ADC can be synchronized by PWM modules
•
Two Quadrature Decoders (Quad Dec0 & Quad Dec1), each with four inputs, or two
additional Quad Timers A & B
•
Two dedicated General Purpose Quad Timers totalling six pins: timer C with two pins and
timer D with four pins
•
CAN 2.0 A/B Module with 2-pin ports used to transmit and receive
•
Two Serial Communication Interfaces (SCI0 & SCI1), each with two pins, or four additional
GPIO lines
•
Serial Peripheral Interface (SPI), with configurable 4-pin port (or four additional GPIO lines)
•
Computer Operating Properly (COP)/watchdog timer
•
Two dedicated external interrupt pins
•
14 dedicated General Purpose I/O (GPIO) pins, 18 multiplexed GPIO pins
•
External reset pin for hardware reset
•
JTAG/On-Chip Emulation (OnCE) for unobtrusive, processor speed-independent debugging
•
Software-programmable, Phase Lock Loop-based frequency synthesizer for the DSP core
clock
Table 2-1. Memory Configuration
DSP56F801
DSP56F803
DSP56F805
DSP56F807
Program Flash
8188 x 16-bit
32252 x 16-bit
32252 x 16-bit
61436 x 16-bit
Data Flash
2K x 16-bit
4K x 16-bit
4K x 16-bit
8K x 16-bit
Program RAM
1K x 16-bit
512 x 16-bit
512 x 16-bit
2K x 16-bit
Data RAM
1K x 16-bit
2K x 16-bit
2K x 16-bit
4K x 16-bit
Boot Flash
2K x 16-bit
2K x 16-bit
2K x 16-bit
2K x 16-bit
The key feature of the motor control DSP is the inclusion of PWM modules. The device is designed to
control most motor types, including induction motors. An interesting feature for controlling the AC
induction motor at low speeds is the patented PWM waveform distortion correction circuit. Each
PWM is double-buffered and includes interrupt controls. The PWM module provides a reference
output to synchronize the Analog-to-Digital Converters.
2
3-Phase AC Induction Motor Vector Control
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